Superheater for boilers.



E. G. MEIER. SUPERHEATER FOR BOILERS. APPLICATION FILED MAR 3.1917

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Patented 0st. 30,1917.

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" dwam E. C. MEIER.

SUPERHEATER FOR BOILERS,

APPLICATION FILED MAR. 3, I917.

Patented 905;. 30, 1091?. 5 DI'IEETS-$H ET 2 wwso.

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O, OO I 00 O OO E. C. MEIER.

SUPERHEATER FOR BOILERS.

APPLICATION FILED MAR. 3, 191?. 7 1,244,536. Patencefi m 30,191?

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E. 6. MEIER.

SUPERHEATER FOR BOILERS.

AEPUCATIOH HLED MAR. a. 9n.

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Patented Oct. 30,1917.

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E. C. MEIER.

SUPERHEATER FOR BOILERS.

APPLICATION FILED MAR- 3, 191?.

Patented 0st. 30, 1917.

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iTNi E s A s F IQ EDWARD C. MEIER, O}? PHOENIXVILLE, BENNSYLVANIA,

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To all'whom it may concern:

I Be it known that I, EDWARD G. Mninma citizen of the 'United States,residing at Phoenixville, in the county of Chester and State ofPennsylvania, have invented certain new and useful Improvements inSuperheaters for Boilers, of which the followiug' is a specification.

My invention consists of an improved su-v perheaterstructure forboilers.

In various types ofboilers employingsuperheaters, the water tubes,drums, and other elements which contain water to be convertedintosteani, are heated by the hot gases and other products of combustionbefore the latter come in contact With the superheater. V In theseconstructions it is obvious that a great part of the heat is, absorbedbefore reaching the superheater.

For certain purposes where an exceptionally high temperature andpressure of superheated steam is not necessary, boilers of said typesarepractical. However, where it is necessaryto secure and maintainsuperheated steam under high temperature and pressure, such for exampleas for use in connection with turbines, boilers ofthe above mentionedtype have been found in efficient for the reason that-in order to securesuflicientheat for the superheater, it is necessary to constantly forcethe furnace to its fullest capacity and in some instances wheresuperheated steam at extremely high temperature and 'pressure'isrequlred, bollers of said type are entirely inadequate.

One object of my invention is to provide a boiler with a superheaterstructure which is made in such manner thatthe hot gases and productsofjcombustion will engage the tubes, or otherconduits for thesteamtobesuperheated, prior to their passage to the water tubes or other elementswhich contain water to be converted into steam.

Another object is to provide a superheater housing which will act toprevent the depositjof the heavier particles of fuel in combustion, onthe tubes or other portion of the superheater proper.

"A further object is to so construct said housing and other portion ofthe boiler that the hotgases will becaused to circulate through thesuperheater housing.

Anotherobject is to provide means for regulating the amount of the,products of combustion which circulate through the su:

Specification of Letters Patent.

from that shown in Fig. 1.

perheater housing and thereby regulate the degree of temperature andpressure of the superheated steam. 1

A still further object is to make my invention of simple constructionand so that it can 'be quickly and easily installed and cleaned.

larged scale.

-Fig. 4C is a section'on the'line H of,

Fig. 3. p

Fig. 5 is a view of the same general na ture as shown in Fig. 1 butshowing my invention' applied to what is known as a Three passboiler "inwhich thefiues from thesupe'rheater housing extend at an angle andopen'into space within one of the passes "'ancli'betweentwo of thelongitudinally extending baflles for a purpose hereinafter fullydescribed."

Fig. 6 is a View of the same general type of boiler shown in 'Fig. 1,but inwhich certain of the elements relating to the superheatingstructure are differently positioned Fig is a fragmentary elevation on areduced scale showing a modified form in the construction of one of thesuper-heater fines. Referring to Figs. lto'a inclusive, l represents asupporting structure which may be of brick and which forms a support forthe, water legs 2 and 3 of a boiler having water tubes awhich'communicate with the water legsQ and 3 and are/arranged atfaslight incline. from the horizontal.

lhe supporting structure 1 forms the inclosure for the boiler inwhichfare located the grate bars 5, said grate bars attheir rear endterminating in a wall 6 whichleads transversely across the inclosure andextends to a height a short distance above the upper level of the gratebars 5; l W 1 The'wall 6 serves to divide the interior of Patented Oct.so, 1917.

Application filed March 3, 1917, Serial No. 152,179. V

described.

the inclosure into two compartments? and 8. The compartment 7 forms thefire box, while the compartment 8 forms what is known as the-combustionchamber, the

Battles 11. and12 are formed onand between certainot the tubese, andthese baffles may be made up of a series ottile'positioned andconstructed for example as shown and described in my prior United StatesPatent No] 1,188,967 N dated June 27, 1916."

The batliell is positioned on the lower tubes 4 and extend from thefront water leg 2 rearwardly, stopping short of ithe water leg 3,so'that to provide a passage through which the products of combustionfrom the combustion chamber8can enter between the tubes 4.

The bafiie 12, onthe other hand, extends forwardly from the rear waterjacket 3 and stops short of the front water leg 2 and is positionedadjacent the. uppermost tubes 4, thus compelling theproducts ofcombustion to pass. between the tubes e throughout their entire lengthprior to its entering into the chamber 13 which is formed between thebaffle 12 and the upper or top covering 14.

The products of combustion after passing through the passage 12eventually pass outwardly through the flue to the chimney andatmosphere.

In carrying out my invention, I provide two partitions 15and16,saidpartitions being spaced from the side walls 17 and 18 oft-hesupporting structure 1. These partitions extendfrom the wall 6rearwardly and intersect the rear wall'19 of said supa portingstructure. Covers 20 and 21 are preferably made of porous fire brick andextend from the partitions 15 and 16 respectively to the sidewalls 17and 18 and thus provide chambers 22 and 23*,it being noted that saidcovers also extend from the wall 6 to the wall 19.

By this construction, a central chamber 24 is formed between thepartitions 15 and 16, this chamber being open at its top and directlycommunicating with the uppermost part of the combustion chamber 8, itbeing noted that saidpartitions 15 and 16 and the covers 20 and 21 arelocated in the combustion chamber 8.

Inlet ports or openings 25 and 26 are provided in the partitions 15 and16 and communicate with the central chamber 24 and with the chambers 22and 23. I also provideside fiues 27 and 28 within the walls 17 and18 andthese flues attheir bottom portions communicate with the chambers 22 and23 respectively. At their upper'ends, the fines 2 7- and 28 communicate'with' the spacesf'betweenl the tubes d and between'th'e battles 11. and12. Y

Superheaters and 30 have their heads 31 mounted within the rear wall 19,and their tubes project into the chamber and 23 respectively. Theforward end of said. superheater tubes rest on'pedestals 33 which arelocated withinthe chambers 22 and As illustrated in Figs. 1; toinclusive, the tubes 32 of the superheater extend forwardly andstopshort ot the inlet ports 25 and 26, itbeing noted thatsaid. inlet portsare formed in the extreme forward end of the partitions and I that, theflues 2? and 1 28 intersect the c hambers 22 and 23at the extremerearend thereof;

Dampers are pivotally mounted within the upper-ends of the tines27.,and28.

and have rods 35v which extend beyond the outer surface of therear wallThe superheaters 3O connect with the drum 9 and receive their steamtherefrom through the medium of, a pipe 36, said pipe being broken awayin Fig. 1 of the drawing, but itwill .be noted that this pipeconnectswith theinlet passages 37 of the superheater, said superheater beingprovided with outlet pipes 38 for conducting the superheated steam. Adoorway 39 is formed inrthe rear wall 19. and.communi cates with thelower por ti on otthe central chambe 24. This doorway permitsthe readycleaning of the central chamber 24:.

My invention operates as follows: Thehot gases andproducts of combustionarising from thegrate' 5, pass over the top ofthe wall6; A portionotthesefgases pass rearwardly over the covers 20 and 21 and centralchamber 251, 'andthen upwardly between the tubes at and battles 11 and.12, and then through the openingprovided between the forward end of thebathe 11 and I the waterleg 2 to the chamber 13 and flue 10. Thismovement of the gases produces a suction through the side lines 27, and28, and causes a portion of the hot gasesto pass downwardly into thecentral chamber 24 and then through the inlet ports 25 and, 26 into thechambers 22 ,and.23,, then through the fiues 27.,and 28 into thespacebetween the tubes 41 and the battles 11 and 12.1

The portion of gas which thus passes tremely high degree.

through. the chambers 22 and 23 isexcep- "tubes within saidchambers 22and'23 are therefore heated to a very high temperature, thus heating thesteam therein to an ex- By providing the chambers 22 and'23 with thepartitions and 16 and the covers 20: and 21, they'are protected againstthe depositof dirt, sinceonly the lighter -particles of the products ofcombustion will pass through the inlet ports and 26, the

heavier dirt collecting on the tops of the,

covers 20 and 21,and at the bottom of the central chamber 24. c

The chamber 24 can be readily cleaned through the'doorway 39, and thedirt on-the covers 20 and 21 can be readily scraped therefrom through'themedium of the firing door d0 which is formed in'the front wall 41 ofthe supporting structure. Also, by making the covers 20 and 21 of aporous fire brick, heat will penetrate them to the exclusion of the dirtand will thereby tend to more efliciently heat the super-heater tubes;r,

By the adjustment of the dampers 34, the amount of the gases circulatingthrough the chamber-s22 and 23 can be regulated to suit variousrequirements as to the degree and pressure of the superheated steam,since it i will be noted that said dampers when moved will vary theamount of opening in the fines 27 and 28. I i

In Fig. 5, I have shown my invention in connection with what is known asa Three pass boiler including three baffles 4.2, 43, and 4%. In thisconstruction I have shown municat'ing with the rear of the superheatingchamber and opening directly into the space between the bafiies 43 and44. In all other respects the construction shown in Fig. 5is'substantially identical to that'described in connection with Figs. -1to a in elusive, and I have therefore given similar parts correspondingreference numerals.

In Fig. 6, I have illustrated my invention in connection with a two passboiler of the type shown in Fig. 1, but instead of having the inletports opening into the forward ends of the superheater chamber I haveshown them entering the rear, one of said inlet ports being indicated bythe reference numeral 16. In this instance, I form the side wall flue,indicated at T7, so that it intersects the forward part of thesuperheater chamber and also directly opens into the space between theupper baffle 48 andthe lower baffle 49.

those previously described in connection with F igs 1 to t inclusive,and I have therefore given similar parts corresponding referencenumerals. In my present invention, the super-heater receives direct heatfrom the fire box, while the same is at a high temperature. This portionof the products of combustion, after heating the superheater tubes,passes betweenthe. tubes of the boiler proper and thereby acts to heatthe latter in combma-.

tion with the gases which pass directly from the fire box to the boilertubes, thus the products of combustion passing through the superheaterchambers perform another function in that it assists in generating steamdue to 1ts passage throughthe boiler tubes -p11013t0 passing off throughthe chimney.

It is well known that if tubes become burn out. Therefore, my presentinvention is valuable in that it protects the'tubes from dirt and alsopermits them to be heated by theproducts of combustion directly from thefire box. i

It willbe noted that in the several views of drawing, I have shown awell known type of superheater including the head 31. and the tubes 32,however, it will be understood that any form of superheater can be usedin which the tubes can be extended into the chambers 22 and 23.

{Ileaning passages 50 are formed through the rear wall andon a levelwith the floor of the superheating chambers 2 and 23. These passagespermit the removal of any dust whichcollects on the floor of thesuperheating chambers and are preferably closed at their outer ends bydoors 51.

Fire brick doors '52 and 53 are located within the central chamber 24and are slid able by rods 54: and 55 respectively which pass through therear wall. These fire brick doors can be moved into position to'closethe inlet ports or openings 25 and, 26 if it is desued to cut-off thesuperheating chambers 22 and 23 from the products of combustion.

F or example, if it is desired to remove the superheaters, it is onlynecessary to close the dampers 3% can also be closed, thus permit tingthe removal of the superheaters withremove the sentire superheatcrssince they may be pulled outof the rear wall and being ata low level,they may be readily repaired and replaced.

In the form of my invention shown in Fig.

7, instead of having, the outlet flues extending at an angleupwardlysuch as shown in Fig. 0,1 form they flue substantially vertlcal "doors;52' and 53 and the super-heaters may be bod1lyremoved,.1t being notedthat the .with Fi g. 5, and I have therefore given similar parts likereference numerals.

One of the important features of my invention is the formation of thetines in connection with the outlets of the superheater chambers and tolocate the dampers 3a within the fines where they do not receive thedirect heat from the furnace. By this construction I can usecomparativelythin dampers without fear of their being readily burnedout. F 2 of the drawing shows these dampers located at the extreme upperends of the fines 27 and 9.8, and the hot products of combustion aretherefore compelled to pass entirely through the superheating chambersand fines prior to their engagement with the dampers. This renders myinvention extremely practical since in various types of boilers, dampershave always been troublesome in view of the fact that they readily burnout and in order to prevent their burning out, it was customary to makethem of heavy fire brick.

While I have described two superheaters and two covered chambers, itwill be noted that if desired only one of the covered chambers can beused or more than two covered chambers can be used, however, in eachinstance I prefer to form the inlet opening in the partition whichprovides the covered chamber.

Vhile I have described my invention as taking a particular form, it willbe understood that the various parts of my invention may be changedwithout departing from the spirit thereof, and hence I do not limitmyself to the precise construction set forth, but consider that I am atliberty to make such changes and alterations as fairly come within thescope of the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Let- ;ucts of combustion into said chamber, said means alsohaving an outlet opening for said products of combustion leading fromsaid chamber, anda superheater extending withinsaid chamber,substantially as described.

2. The combination with a boiler, of a superheater constructionincluding 'means providing an elongated horizontally extending chamberarranged below the steam-generating elements of the boiler andsubstantially on a level with the fire box; thereof,

said means including a side wallhaving an chamber alongside of saidsuperheaterchamher and with which said inlet opening communicates, saidsecond chamber serving as 'a conducting passage for the products ofcombustion prior to their entering the superheater chamber.substantially as described. The combination with a water tube boiler, ofmeans providing a superheater chamber arranged below the water tubesand.

substantially on a level with the firebox of the boiler, said meansincluding a side wall having an inlet opening for laterally admittingthe products of combustion into said chamber, and baflies interposedbetween the tubes of the boiler and extending longitudinally thereof,said first means providing an outlet flue, for the products ofcombustion from said superheater chamber, said flue having its outletopening between said baffies, substantially as described. I

l. The combination in a boiler, of a fire bor. a combustion chamberadjacent thereto, a partition in said combustion chamber and spaced froma side wall thereof, a cover extending from the partition to the sidewall and providing a superheater chamber, said partition having anopening therein for permitting the products of combustion to enter thesuperheater chamber from the side, means providing an outlet opening forthe superheater chamber and a superheater extending within saidsuperheater chamber, substantially as described.

5. The combination in a boiler, of a supporting structure includingfront, side, and rear walls, a fire box formed at one end of saidstructure, a combustion chamber formed in the opposite end of saidstructure, a wall extending transversely between the fire box and thecombustion chamber, a partition extending from said latter mentionedwall to the rear wall of the supporting structure, said partitionextending substantially parallel with one of said side walls anddividing the lower portion of the combustion chamber, a cover extendingfrom said partition to one of said side walls and with the partitionforming a superheater chamber, said partition having an opening thereinfor between the permitting entrance of the products of combustion fromsaid combustion chamber into the side of said superheater chambeig'meansforming an outlet for" 'said superheater chamber, and a superlieaterextending with in said latter mentioned chamber, substantially asdescribeda 1 6. The combination in a water tube boiler, of a supportingstructure including 'front side, and rear walls, a fire box formedat oneend of said structure, a combustion cham-, ber formed in the oppositeend of said structure, a wall extending transversely between the'firebox and the combustion chamber, a partition "extending from said lattermentioned wall'tothe rear wall of the suppor ing structure, saidpartition extending sub stantially parallel with one of said side Wallsand dividing the lower portion of the combustion chamber, a coverextending from said partition toone of said side walls and, with thepartition, forming a superheater chamber, said partition having an:opening therein for permitting entrance of the products of combustionfrom said combustion chamber into thesideof saidsuperheaterchamberfmeans forming outlet for said superheater chamber, a superheaterextending,within said latter mentioned chamber, means forming a flue-ofcomparatively small cross section, said flue. extending from the outletopening of said superheater chamber and opening into the space watertubes, substantially as described. p 7 a 7. The combination in a watertube" boiler, of a? supporting structure including front,

side, and rearwalls, a fire box formedin said structure, a combustmnchamber ad] a.-

cent said fire box, a wall extending transversely between the fire boxand the combnstion chamber, a partition extending from said transverselyextending Wallto the rear wall of the supporting structure, saidpartition dividing the lower portion of the combustion chamber, a coverextending from 'said partitionto one of said side walls and with thepartitiongforming a" superheating chamber, said partition having anopening therein for permitting entrance of the f products of combustionfrom said combustion, chamber into the side of said superheater chamber,water tubes arranged above "said fire box and combustion chamber, two

superimposed bafiles interposed between the water tubes extendinglongitudinally thereto to form a'passage for the products of combustionfrom said fire box, a superheater extending within said super-heaterchamber, means: providing an outlet opening communicating with said,superheater chamber, and a; flue extending from saidoutlet passage andhaving its entire outlet end leading into the space. between saidbafiics, substantially as descr bed,

7 8. The combination in a boiler, of a. supporting structure includingfront, side, and rear walls, a. fire box formedi'n' said structure, acombustion chamber adjacent said fire box, a wall extending transverselybe tween the the 'box and therombustion chamber, two partitions spacedfrom the side walls and extending between said transverse wall and therear wall, covers extending from said partition to said side walls andthereby forming covered chambers, said partitions being spaced apart toform a central chamber which is open at its top and. communicatingwiththe combustion chamber,'inlet openings in said partitions andcommunicating respectively'with'the central chamber and the coveredchambers, water tubes mounted above said combustion chamber, belliesspaced apart and arranged adja cent said water tubes,superheaters'extending within said covered cliambers,and fines ber, twopartitions spaced "from the side" walls and extending between saidtransverse wall and the rear wallQcovers extending from said partitionto said side wa-llsand thereby forming covered chambers, said partitionsbeing spaced apart to form a central chamber which "is open at its topand communicating with the combustion chamber, inlet openings in saidpartitions and communicating respectively with the central chamber andthe=covered chambers, water tubes mounted above said combustionchamber,baflles spaced apart and arranged adjacent said watertubes,"superhcaters extending within'said covered chambers, and finescommunicating with said covered chambers" and opemng' into the spacebetween said water tubes and between said bat les, substantially asdescribed.

"10; The'combinatlon in a boiler, of asupporting structure includingfront, side, and" rear walls, affire' box formedin said strucmescombustion chamber adjacent said fire box, ,a wal-lfextending'transversely be. tween the fire box and the combustion chamber, twopartitions'spaced from the side; walls and extending between saidtransverse 'wall and the rear wall, covers extending from said partitionto said side .walls and thereby forming covered chambers, saidpartitions being spacedhapart to re central chamber which is open at itstop alld communicating with the combustion, chamber, inlet openingsinsaid partitionsand communicating respectively with the central chamber.and the covered chambers, water tubes mounted above said combustionchamber, baffles spaced apart and arranged adjacent said water tubes,superheaters extending within said .covered-chambersfiues comgnunicatingwith said covered chambers and opening into the space between said watertubes, and dampers for regulating the passage of the products ofcombustion through said covered chambers, substantially as de ri ed e11. The combination in a boiler, of a sup porting structure includingfront, side, and 7 rear walls,a fire box formed in said structure, acombustion chamber adjacent said,

fire, box, a wall extending transversely between the fire box and thecombustion chamher, two partitions spaced from the side walls andextending between said transverse wall and the rear wall, coversextending from said partitions to said side walls and ,thereby formingcovered chambers, said partitions being spaced apart to form a central 7chamber which is open at its top and comfmunicating with the combustionchamber,

inlet openings in said partitions and comjmu nicating respectively withthe central chamber and the covered chambers, water tubes mounted abovesaid combustion chamber, baflies spaced apart and arranged adjacent saidwater tubes, super-heaters extending within said covered chambers, fiuescommunicating with said covered chambers and opening into the spacebetween said water eltubespand dampers'interposed within said fines forregulating the passage of the products of combustion through saidcovered chambers, substantially as described. 7 m 12. The combinationina boiler, of a sup- 40 porting structure including front, side, and

rear walls, a fire box formed in said structure, a combustion chamberadjacent said fire box, a wall extending transversely between the firebox and the combustion chamber, two partitions spaced from the side gwalls and extending between said transverse wall and 'tl16 161I wall,covers extending from said partition to said side walls and therebyforming covered chambers, said par- J titions being spaced apart to forma central .chamber whichis openat its top and communicating with thecombustion. chamber,

i inlet openings in said partitions and com- M municating respectivelywith the central .phamberv and theucovered' chambers, water tube'smounted above said combustion cham- ;,ber, baffles spaced apart andarranged adjafcent said water tubes, superheaters extend- .ing-withinsaid covered chambers, and fiues ingewith said covered chambersandopening ,mto the space betweensaid water tubes,

'jsubstantially as'described.

and between scrlbed.

,li'iffllhe combination in a boiler, of a suprear walls, a' fire boxformed jincsaid structure-,n combustion chamber adjacent said fire box,a wall extending transversely between the fire box and the combustioncham: ber, two partitions spaced from the} side walls and extendingbetween said transverse wall and the rear wall, covers extending fromsaid partition to. said side walls and thereby forming covered chambers,said partitions 'being spaced apart to form a central chamber which isopen at its topand communicating with the combustion chamber, inletopenings in said partitions and communicating respectively with thecentral said central chamber, substantially as described.

1st. The combination in a boiler, of a sup porting structure includingfront, side, and 'rearwalls, a fire box formed in said struchire, acombustion chamber adjacentsaid fire box, a wall extending transverselybetween the fire box and the combustion chamber, two partitions spacedfrom the side walls and extending between said transverse wall and therear wall, covers extending from said partition to said side wallsaiidthereby forming covered chambers, said par- ,titions'being spaced apartto form a central chamber which 18 open at 1ts top and commun1cat1ngwith the combustion chamber,

inlet openings in said partitions and communicat ng respectively withthe central chamber andthecovered chambers, water tubes mounted abovesaid combustion chamber, baflies spaced apart and arranged adjacent saidwater tubes, superheaters ext-end-' ing within said covered chambers,and fines formed in said side walls and communieating withsaid coveredchambers andopening into the, space between said water'tubes thebaifiies, substantially as, de-

15. A superheater inclo'su're for steam bollers'including a wall formingafpartition adjacent the combustion chamber of the boiler, saidpartition including an opening for laterally admitting the products ofcomlb ustion into the chamber provided by'the I inclosure, and a doorfor closing said openit ing, substantially as described.

60 formed insaid sidewalls and connnuuicat- 16. A superheater inclosurerfor steam ,boilcrs including a wall forming a partition adjacent thecombustion chamber of the boiler, said partitio nincluding an openingfor laterally admitt ng the products of com-,

bustion into the chamber provided by the inclosure, and a door slidablymounted adjacent said opening and adapted to regulate the amount ofproducts of combustion entering said compartment, substantially asdescribed.

17. The combination in a boiler, of means providing a combustionchamber, bafiles located above said combustion chamber and spaced apartto provide a passage for the products of combustion, means providing asuperheater chamber, an inlet opening in said superheater chambercommunicating with the combustion chamber, and an outlet flue leadingdirectly from the super-heater chamber and having its entire outlet endopening into the space between said baffles at a point Within the lengththereof, substantially as described.

18. The combination in a boiler, of means providing a combustionchamber, bafiles located above said combustion chamber and spaced apartto provide a passage for the products of combustion, means providing asuperheater chamber, an inlet opening in said superheater chambercommunicating with the combustion chamber, an outlet flue leadingdirectly from the superheater chamber and having its entire outlet endopening into the space between said baflies at a point within the lengththereof, and a damper in said flue located in a position remote fromsaid superheater chamber, substantially as described.

19. The combination in a boiler, of means providing a combustionchamber, baliles located above said combustion chamber and spaced apartto provide a passage for the products of combustion, means providing asuperheater chamber, an inlet opening in said superheater chambercommunicating with the combustion chamber, and an outlet flue leadingdirectly from the superheater chamber and extending upwardly, said fluehaving its entire outlet end opening into the space between the bafflesat a point within the length thereof, and a damper located adjacent theupper end of said flue, substantially as described.

20. The combination in a boiler, of a supporting structure, a fire boX,a combustion chamber directly adjacent the fire box, a partition in saidcombustion chamber dividing the lower part thereof, a cover extendingfrom said partition to a side wall of the supporting structure to form asuperheater chamber, said partition having a side opening therein toadmit products of combustion laterally into the superheater chamber,means providing an outlet opening for said superheater chamber, a doorfor closing said first opening, and a superheater extending into saidlatter chamber, substantially as described.

21. The combination in a boiler, of a supporting structure, a lire box,a combustion chamber directly adjacent the fire box, a partition in saidcombustion chamber dividing the lower part thereof, a cover extendingfrom said partition to a side wall of the supporting structure to form asuperheater chamber, said partition having a side opening therein toadmit products of combustion laterally into the superheater chamber,means providing an outlet opening for said superheater chamber, asuperheater extending into said latter chamber, means providing a dustcleaning passage communicating with the superheater chamber, and a doorfor closing said passage, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWARD C. MEIER.

Witnesses,

F. H. MEIER, 7 N. JOHN NELSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

